Clamp



(No Model.)

u P. BROWN.

CLAMP; No. 444,484 Patented Jan. 13, 1891.

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l l I Wmme A Ng @51g 111,41V @Hom/WWW Il f l UNITED STATES PATENT OFFICE.

PERRY BRCIVN,OF LOUISVILLE, KENTUCKY.

SPECIFICATION forming part of Letters Patent No. 444,484, dated January 13, 1891.

Application filed September l2. 1889. Serial No. 323,713. (No model.)

.To all whom, t may concern:

Be it known that I, PERRY BROWN, a citizen of the United States, residing at Louisville, in the county of Jefferson and State of Kentucky, have invented certain newand useful Improvements in Clamps, of which the following is a specification, reference being had therein to the accompanying drawings.

This improvement is designed to furnish clamps provided with screws, with means whereby they may be rapidly fastened and unfastened, as required; and the invention consists in the peculiar' construction, arrangement, and combination of parts hereinafter more particularly described and then defrnitely claimed.

In the accompanying drawings, Figure 1 shows a side view ofa screw-clamp provided with my improvement. Fig. 2 is a longitudinal section of the same through the line ac in Fig. 1. Fig-.3 is a cross-section of a double clamp on ,the same plan adapted to be used on hand-screws. Fig. t is a cross-section of a modification of Fig. 1. Fig.5 is a detached View of one of the jaws. Fig. G is an elevation,and Fig.7 is an edge view,of the same.

Referring now to the details of the drawings and more particularly to Figs. 1 and 2, `A represents the bod y ofthe cIa1np,in which are set two jaws B B', having threads cast orotherwise formed on one of their ends and their other ends tapered oft to tit in recesses a in the body A. At C is shown a thumbpiece having a shank c, which passes through the jaws and through the rib a', formed on the body, and is held by a washer and pin, as plainly shown. Surrounding this shank is a spring D, which acts against the jaws and forces them open. On the jaw B is formed one or more inclines b, (preferably two, as shown in Figs. 6 and 7,) onl which ride the lower` edges of the thumb-piece which, as it is turned, presses the jaws together and thus firmly clamps the screw E between them. By this arrangement it will readily be seen that as the thumb-piece C is turned in one direction the spring opens the jaws B B', so that the screw can be readily and rapidly moved'lengthwise through them, so as to a1- low of the head of the screw being brought into vtolerably close contact with the object to be clamped, when a turn of the thumb piece C will bring the jaws close to the screw and hold the same firmly, so that a slight turn of the latter will securely hold whatever may be in the clamp. When it is desired to loosen the article held in the clamp, it is only necessary to turn the thumb-piece C, when the screw will readily slide through the jaws, and thus any article may be readily clamped or unclamped without the necessity of turn'- ing the screw fora long time before the screw will begin to act upon the article being clamped.

ticularlyadaptefl to be used on what is known as hand-clamps in which there are two screws. In this case the jaws are double, having threads at each end to embrace the two screws, and the thu rnb-piece is in the center with springs near each end instead of being around the shank of the thumb-piece, as in Figs. 1 and 2.

Fig. 4 shows a modification of Figs. 1 and 2,in which one of the jaws is cast integral -with the body. In this case I generally thread only the removablejaw, although both might be threaded, if preferred. I consider this'as heretofore described,in which two movable pieces are used.

1. The combination, in a clamp, ofthe body A, the screw E, the jaws B B', embracing said screw, the spring D, the thumb-piece C, and an incline b between the jaws and the thumbpiece, substantially as described.

2. The combination, ina clamp, of the body A,the screw E, the thumb-piece C, the spring D, surrounding the shank of the thumb-piece, and the two movable jaws B B', embracing said screw and having on one of them the inclines all substantially as shown and described.

In test-imony whereof I affix my signature, in the presence of two witnesses, this 3d day of September, 1889.

PERRY BROYVN.

\Vitnesses:

ALEX. S; STEUAET, Tiros. E. ROBERTSON.

The device shown in Fig. 3 is more par-r the equivalent in some respects of the devicev 

